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Solve 7x + 9 = 79

The solution of 7x + 9 = 79 is x = 10.

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The lines y = 7x + 9 and y = 79 meet at x = 1046810121416406080100120x = 10y = 7x + 9y = 79
The lines y = 7x + 9 and y = 79 meet at x = 10. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    7x+9=797x + 9 = 79
  2. 2

    Subtract 9 from both sides:

    7x+9−9=79−9 ⇒ 7x=707x + 9 - 9 = 79 - 9 \ \Rightarrow\ 7x = 70
  3. 3

    Divide both sides by 7:

    7x7=707 ⇒ x=10\frac{7x}{7} = \frac{70}{7} \ \Rightarrow\ x = 10
  4. 4

    Check: put x = 10 back into the equation.

    7⋅10+9=70+9=79✓7\cdot10 + 9 = 70 + 9 = 79 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 9 = 79\ \Rightarrow\ x = 10 \]
\[ 7x + 9 = 79 \]
\[ 7x + 9 - 9 = 79 - 9 \ \Rightarrow\ 7x = 70 \]
\[ \frac{7x}{7} = \frac{70}{7} \ \Rightarrow\ x = 10 \]
\[ 7\cdot10 + 9 = 70 + 9 = 79 \checkmark \]

Trying values of x in 7x + 9 = 79

x7x + 9Equals 79?
865no
972no
1079yes
1186no
1293no

Questions

What is x in 7x + 9 = 79?

The solution of 7x + 9 = 79 is x = 10.

How do you solve 7x + 9 = 79?

Subtract 9 from both sides to get 7x = 70, then divide both sides by 7 to get x = 10.

How do I check the answer?

Replace x by 10: 7(10) + 9 = 79, which is 79.

Similar equations

    Solve 7x + 9 = 79: x = 10 (steps and check) | WordGPT